Massey Ferguson D146 – Dash / Instrument Panel: X56 - Power Control lever: Electrical signal too high.

The signal voltage returning from the Power Control lever's potentiometer or switch to the controller exceeds the maximum expected threshold, typically indicating a short circuit to power (+12V) within the lever's internal circuitry or in the wiring harness.

• MF 8650
• MF 8680
• Interim Tier 4 (2012-2015)
• 7615
• 5613
• MF 8480
• MF 8450
• 7616
• 7618
• 5608
• 7619
• 7626
• MF 8660
• 7624
• MF 8690
• 7614
• MF 8470
• 5610
• 7620
• MF 8600
• MF 8460
• MF 8670
• 5612
• 7622
• 5611
• 5609
• 8600 Series
• 8670
• 8690
• 7600 Series
• 5700 SL Series
• 5710SL
• 5711SL
• 5712SL
• 5713SL
• 5400 Series

1. 1

   Inspect the wiring harness running down the steering column from the X56 Power Control lever to the dash for pinched wires, chafing, or exposed copper shorting to a +12V power source.

2. 2

   Disconnect the lever's electrical connector and check for moisture, corrosion, or bent pins that could bridge the power and signal circuits.

3. 3

   Perform a voltage/short test on the signal wire at the harness side with a multimeter. If voltage remains near 12V while unplugged, the short is in the harness. If it drops to normal baseline levels, the lever's internal circuitry is shorted.

1. 1

   Disconnect Power

   Turn off the ignition and disconnect the negative battery cable to prevent electrical spikes.

2. 2

   Access the Lever

   Remove the plastic cowling/trim covers on the left side of the steering column to expose the base of the Power Control lever.

3. 3

   Disconnect Wiring

   Unplug the electrical harness connector from the X56 lever assembly.

4. 4

   Remove the Lever

   Remove the retaining screws or bolts securing the lever bracket to the steering column and pull the faulty unit out.

5. 5

   Install the New Part

   Mount the new Power Control lever into position and secure it with the retaining hardware.

6. 6

   Reconnect

   Plug the electrical harness back into the new lever, ensuring the locking tab clicks into place. Route the wiring carefully so it will not be pinched by the steering column covers.

7. 7

   Reassemble

   Reinstall the steering column cowling and trim.

8. 8

   Test

   Reconnect the battery. Turn the ignition on and verify that the D146 code has cleared from the dash. Test the forward, reverse, and neutral shuttle functions. (Note: Depending on the exact model and transmission, a dealer calibration of the new lever via the instrument panel or diagnostic tool may be required).